CN103433347A - Inductor for divisionally and incrementally forming bimetal composite pipe - Google Patents

Abstract

The invention provides an inductor for divisionally and incrementally forming a bimetal composite pipe, which belongs to the technical field of forming of the bimetal composite pipe and aims to improve the divisional and incremental forming composite rate of a bimetal composite pipe fitting and the radial uniformity of the bimetal composite pipe fitting. According to the inductor, one assembling hole communicated with two circular-platform-shaped grooves is machined in the middle of a cylinder; a region around the assembling hole is a working region; the assembling hole is composed of a large circular-platform-shaped hole and a small circular-platform-shaped hole; the small-diameter end of the large circular-platform-shaped hole is overlapped with the large-diameter end of the small circular-platform-shaped hole; the large-diameter end of the large circular-platform-shaped hole and the small-diameter end of the small circular-platform-shaped hole are located at the two ends of the assembling hole respectively; an included angle between the generatrix of the large circular-platform-shaped hole and the horizontal plane is alpha; an included angle between the generatrix of the small circular-platform-shaped hole and the horizontal plane is beta; the axial length of the large circular-platform-shaped hole is L1 and the axial length of the small circular-platform-shaped hole is L2; the axial length of the assembling hole is L0. The inductor for divisionally and incrementally forming the bimetal composite pipe is used for compounding the bimetal composite pipe fitting.

Description

A kind of inductor of subregion progressive molding composite bimetal pipe

Technical field

The present invention relates to a kind of inductor of the composite bimetal pipe that is shaped, belong to bimetal tube forming technique field.

Background technology

Bimetal pipe fitting is comprised of internal layer pipe and outer pipe, between the ectonexine pipe, combines closely.While bearing external applied load, internal layer pipe and outer pipe are out of shape simultaneously.Bimetal pipe fitting can be divided into mechanical bond and metallurgical binding by the combination between the pipe layer, and the former is called again double-deck pipe fitting, and the latter also is called the composite bimetal pipe part.The material of internal layer pipe and outer pipe needs to select different match materials according to working condition, therefore, bimetal pipe fitting not only can have desired high strength, but also can have the performances such as good corrosion resistance, wearability, gives full play to the advantage performance of two kinds of metal materials.Compare with the pipe fitting of one-component, due to the advantage of bimetal pipe fitting at aspects such as specific strength, economy, have broad application prospects in the industrial circles such as oil, chemical industry, refrigeration, nuclear power.

The basic principle of utilizing pulse magnet field force to prepare bimetal pipe fitting as shown in Figure 1.This technique is carried out the SECO electric discharge by 1 pair of coil of electromagnetic forming device 2, and long multiple tube (outer pipe 4 and internal layer pipe 5) is carried out to the compound gradual shaping thinking of subregion.Before processing, outer pipe 4 and internal layer pipe 5 are fixed on clamping bench, and clamping bench can move along the centerline direction of ectonexine pipe.Add man-hour, under the effect of inductor 3, complete primary electric discharge shaping processing.Completed the ectonexine pipe of first recombination region processing along with clamping bench is done a certain amount of axial feeding together, made to treat that compound bimetallic pipe enters in the workspace 6 of inductor 3 (see Fig. 2 and Fig. 3).Then inductor 3 starts to carry out the electric discharge processing of second step.The bimetal clad pipe blank that has completed second recombination region processing continues to do axial feeding, until complete the compound of whole composite bimetal pipe part.The magnetic pulse formation complex method of composite bimetal pipe part is a kind of manufacturing process that compound bimetallic pipe carries out local deformation for the treatment of, in forming process, inductor 3 is little with the contact area of pipe to be processed, make electro-magnetic forming power more concentrated, energy density is larger, thereby pipe can obtain larger magnetic pressure and carries out moulding processing, can realize utilizing the little energy discharge process large composite bimetal pipe part of some axial dimensions that is shaped by axial feeding, be a kind of very promising forming preparation method simultaneously.

Inductor is an important device in composite bimetal pipe part magnetic pulse formation composite algorithm, play the electric energy conversion that will store in capacitor and become to be applied to the impact force action on bimetal clad pipe blank, can also optimize discharge frequency, control impuls power effect zone, improve the coil inductor life-span simultaneously, with respect to the induction coil structure of non-inductive device, can significantly improve technology stability and shaping crudy.In the technical process of bimetal clad pipe blank magnetic pulse formation, for the consideration of the aspects such as structural strength, raising local magnetic field strength, as shown in Figures 2 and 3, workspace and outer wall are the coaxial circles cylinder to the normal sensor structure used.In bimetallic pipe subregion recombination process, after the bimetallic pipe is done axial feeding, treat the relative position of bimetal clad pipe blank and inductor workspace as shown in Figure 4.As shown in Figure 4, because the vertical profile cross section of workspace is flat, outer pipe configuration in last composite steps changes, now between inductor workspace and outer pipe, radial clearance has produced larger difference, thereby changed the density degree of the magnetic line of force in the workspace, make distribution of electromagnetic force very uneven, and then cause treating that composite pipe produces the problem of deformation: transition region 7 radial clearances cause greatly the magnetic line of force sparse, the radial electromagnetic force be subject to is significantly less than the electromagnetic force that deformed area 9 is subject to, therefore the preferential generation plastic deformation in deformed area 9, 7 of transition regions are driven distortion laminating internal layer pipe, the radial deformation uneven distribution vertically that finally caused bimetal clad pipe blank to produce.And, along with the radial clearance between the ectonexine pipe increases, this radial deformation inhomogeneities can develop into the transition region metal material piles up protuberance, serious will produce " bulge " defect, as shown in Figure 5, Figure 6.The radially inhomogeneities available radial inequality degree δ of ectonexine composite pipe weighs, and this value obtains by circular runout difference and the ratio of the minimum diameter of composite bimetal pipe part, as shown in formula (1).

$\mathrm{\δ}=\frac{D_{\max }-D_{\min }}{D_{\min }}---\left(1\right)$

D in formula _maxdiameter for composite bimetal pipe part maximum; D _mindiameter for composite bimetal pipe part minimum.In addition, the compatibility of deformation problem that this routine inductor produces also can cause lower metallurgical recombination rate.This is because deformed area 9 clashes into the internal layer pipe in the near vertical mode, can't obtain preferably collision angle and impact velocity coupling, finally, bimetal clad pipe blank interlayer combination be take mechanical bond as main, so, damage the compound interface performance, will limit the scope of application of composite bimetal pipe part.

Therefore, need badly sensor structure is optimized to design, improve composite bimetal pipe part degree of radial uniformity, improve recombination rate, thereby the composite bimetal pipe part that meets specification requirement for acquisition provides necessary condition.

Summary of the invention

The purpose of this invention is to provide a kind of inductor that can improve composite bimetal pipe part subregion progressive molding recombination rate and improve the radially inhomogeneity subregion progressive molding of composite bimetal pipe part composite bimetal pipe.

The present invention addresses the above problem and takes following technical scheme:

The inductor of a kind of subregion progressive molding composite bimetal pipe of the present invention, the profile of the inductor of described subregion progressive molding composite bimetal pipe is cylinder, described cylindrical both ends of the surface in axial direction are processed with respectively a truncated cone-shaped groove, cylindrical middle part is processed with a pilot hole communicated with two truncated cone-shaped grooves, described pilot hole and two truncated cone-shaped grooves coaxially arrange, the zone that pilot hole surrounds is workspace, radially have the slit communicated with pilot hole on cylindrical sidewall, described pilot hole consists of large truncated cone-shaped hole and little truncated cone-shaped hole, the smaller diameter end in described large truncated cone-shaped hole overlaps with the larger diameter end in little truncated cone-shaped hole, and the larger diameter end in large truncated cone-shaped hole and the smaller diameter end in little truncated cone-shaped hole lay respectively at the two ends of pilot hole, the angle become between the bus of setting large truncated cone-shaped hole and horizontal plane is α, the angle become between the bus in little truncated cone-shaped hole and horizontal plane is β, the axial length in large truncated cone-shaped hole is L1, the axial length in little truncated cone-shaped hole is L2, the axial length of pilot hole is L0,

L0=L1+L2 (2)

The size at described α angle is calculated and is obtained by formula (3);

$\mathrm{\α}={\tan }^{-1}\left(\frac{0.5~3\mathrm{mm}}{L1}\right)---\left(3\right)$

The size at described β angle is calculated and is obtained by formula (4);

$\mathrm{\&beta;}={\tan }^{-1}\frac{{\mathrm{<figure-callout\; id="2"\; label="r\; gap"\; filenames="HDA0000381239280000011.png"\; state="\{\{state\}\}">r</figure-callout>}}_{\mathrm{gap}}}{2~6\mathrm{mm}}---\left(4\right)$

In formula: r _gapradial clearance for 4 of internal layer pipe 5 and outer pipes.

The present invention's beneficial effect compared with prior art is: 1) by the bimetallic that is arranged so that at β angle, treat that the transition region of composite pipe preferentially is out of shape, thereby can reduce radially unevenness of this composite pipe, concrete result of implementation show this composite pipe radially unevenness reduce more than 47%; 2) by the setting at α angle, changed the deformation pattern for the treatment of recombination region, optimized the coupling of covering pipe (being outer pipe fitting) impact velocity and collision angle, thereby improved this composite pipe bond strength and recombination rate, with sensor structure commonly used, compare, the bond strength of composite pipe has improved 1.7 times, and metallurgical recombination rate has improved 1.6 times.

The accompanying drawing explanation

Fig. 1 is existing bimetal pipe fitting magnetic pulse formation technical matters principle schematic; Fig. 2 is conventional inductor master TV structure figure; The left view that Fig. 3 is Fig. 2; Fig. 4 is conventional inductor and bimetal clad pipe blank relative position relation figure to be processed; Fig. 5 is radially unevenness schematic diagram of composite bimetal pipe part; The A place partial enlarged drawing that Fig. 6 is Fig. 5; The front view of the inductor that Fig. 7 is subregion progressive molding composite bimetal pipe of the present invention; The left view that Fig. 8 is Fig. 7; The B place enlarged drawing that Fig. 9 is Fig. 8; The inductor that Figure 10 is subregion progressive molding composite bimetal pipe of the present invention and ectonexine metal pipe billet relative position relation figure to be processed.

The specific embodiment

Below in conjunction with concrete accompanying drawing specification the specific embodiment of the present invention.

The specific embodiment one: in conjunction with Fig. 7～Figure 10 explanation, the inductor of a kind of subregion progressive molding composite bimetal pipe of present embodiment, the profile of the inductor of described subregion progressive molding composite bimetal pipe is cylinder 13, the both ends of the surface of described cylinder 13 in axial direction are processed with respectively a truncated cone-shaped groove 10, the middle part of cylinder 13 is processed with a pilot hole communicated with two truncated cone-shaped grooves 10, described pilot hole and two truncated cone-shaped grooves 10 coaxially arrange, the zone that pilot hole surrounds is workspace 6, radially have the slit 14 communicated with pilot hole on the sidewall of cylinder 13, described pilot hole consists of large truncated cone-shaped hole 11 and little truncated cone-shaped hole 12, the smaller diameter end in described large truncated cone-shaped hole 11 overlaps with the larger diameter end in little truncated cone-shaped hole 12, and the larger diameter end in large truncated cone-shaped hole 11 and the smaller diameter end in little truncated cone-shaped hole 12 lay respectively at the two ends of pilot hole, the angle become between the bus of setting large truncated cone-shaped hole 11 and horizontal plane is α, the angle become between the bus in little truncated cone-shaped hole 12 and horizontal plane is β, the axial length in large truncated cone-shaped hole 11 is L1, the axial length in little truncated cone-shaped hole 12 is L2, the axial length of pilot hole is L0,

L0=L1+L2

(2)

The size at described α angle is calculated and is obtained by formula (3);

$\mathrm{\&alpha;}={\tan }^{-1}\left(\frac{0.5~3\mathrm{mm}}{L1}\right)---\left(3\right)$

The size at described β angle is calculated and is obtained by formula (4);

$\mathrm{\&beta;}={\tan }^{-1}\frac{{\mathrm{<figure-callout\; id="2"\; label="r\; gap"\; filenames="HDA0000381239280000011.png"\; state="\{\{state\}\}">r</figure-callout>}}_{\mathrm{gap}}}{2~6\mathrm{mm}}---\left(4\right)$

In formula: r _gapradial clearance for 4 of internal layer pipe 5 and outer pipes.

The specific embodiment two: in conjunction with Fig. 7 explanation, the axial length L 2=2mm in the described little truncated cone-shaped of present embodiment hole 12～6mm.In present embodiment, undocumented technical characterictic is identical with the specific embodiment one.

The specific embodiment three: in conjunction with Fig. 7 explanation, the described large truncated cone-shaped of present embodiment hole 11 is provided with the great transition fillet with 12 junction, little truncated cone-shaped hole, the radius of curvature of described great transition fillet is R1, R1=20mm, large truncated cone-shaped hole 11 is respectively equipped with little knuckle with junction and the little truncated cone-shaped hole 12 of adjacent truncated cone-shaped groove 10 with adjacent truncated cone-shaped groove 10 junctions, the radius of curvature of described little knuckle is R2, R2=1mm.In present embodiment, undocumented technical characterictic is identical with the specific embodiment one.

Being provided for of β angle preferentially is out of shape transition region 7; The setting at α angle, make the radial clearance of inductor and outer pipe 4 increase gradually from right to left, form the field of force reduced gradually from right to left, thereby the distortion of pipe is undertaken by order from right to left, and then realize the coupling of collision angle and impact velocity.The axial length in large truncated cone-shaped hole 11 is the workspace axial length that the α angular zone is controlled, and the axial length L 2 in little truncated cone-shaped hole 12 is the workspace axial length that the β angular zone is controlled, and the span of L2 is between 2～6mm.When internal layer pipe 5 and outer pipe 4 radial clearance values hour, the Near The Upper Limit value of L2 in above-mentioned span, when internal layer pipe 5 and outer pipe 4 radial clearance values when larger, near the value lower limit of L2 in above-mentioned span.The relation of L1 and L2 should meet formula (2), and the axial length L 0 of pilot hole is the axial length L 0 of inductor inwall workspace, and its numerical values recited is relevant with inductor outer wall workspace length L, according to the principle that obtains the optimum current transmission efficiency, determines.The surface smoothness of inductor is wanted strict guarantee.

The specific embodiment four: the described inductor of present embodiment is formed by the metal material processing of high strength, high conductivity.In present embodiment, undocumented technical characterictic is identical with the specific embodiment one, two or three.

The specific embodiment five: the metal material of the described high strength of present embodiment, high conductivity is zirconium chrome copper or beraloy.In present embodiment, undocumented technical characterictic is identical with the specific embodiment four.

Embodiment 1: outer pipe 4 is the 3A21 aluminium alloy, and external diameter is 20mm, and wall thickness is 1mm; Internal layer pipe 5 is 20 steel, and external diameter is 16mm, and wall thickness is 3mm.In Fig. 7, the outer wall of inductor (workspace) length L is 60mm, the axial length L 2 that the axial length L 0 of pilot hole is the little truncated cone-shaped of 15mm(hole 12 is 4.3mm), the outer diameter D1 of inductor is 85mm, large truncated cone-shaped hole 11 is 21.5mm with little truncated cone-shaped hole 12 junction diameter D2, the radius of curvature R 2 of little knuckle is 1mm, by calculating, obtains the α angle and the β angle is respectively 3 ° and 13 °.The output of electro-magnetic forming equipment is connected with two terminals of the red copper wire that coiling 10 circles, cross section are 5 * 7mm, at equipment discharge voltage 10kV, under the condition of capacitance 100 μ F, obtains the 20# bimetal copper-steel composite pipe of outer cladding aluminium.With sensor structure commonly used, compare, described composite pipe radially unevenness reduces more than 47%, and recombination rate improves 1.6 times.

Existing bimetal pipe fitting magnetic pulse formation technical matters principle (see figure 1):

The geometric shape of distortion pipe fitting has not only determined the magnetic field force size that material deformation is required, also can the distribution of magnetic field force be impacted, and then affects the coupling of projected angle of impact and stroke speed simultaneously.The volume in the magnetic field between the electromagnetic force that pipe fitting is suffered and pipe and inductor is inversely proportional to, therefore, by zone, inductor workspace and frock mobile space layout, coordinate, the magnetic field distributed to obtain conformal, magnetic field space is distributed to coincide with deformed shape, thereby collision angle and the stroke speed of the outer pipe of ACTIVE CONTROL and internal layer pipe, to realize the compatible deformation of the progressive recombination process of subregion, and then reach the radially inhomogeneity purpose of composite bimetal pipe part that improves composite bimetal pipe part subregion progressive molding recombination rate and improve the subregion progressive molding.

Electro-magnetic forming machine 1 essence is for producing the device of heavy impulse current, if its internal main energy-storage travelling wave tube capacitor C and discharge switch K.Energy-storage travelling wave tube capacitor C and discharge switch K are via exterior loop 2 and equipment self-resistance Ri and inductance L i formation discharge loop.LRC oscillating circuit principle according in electrotechnics, meeting under certain condition at capacitance C, system inductance L and system resistance R, will produce heavy impulse current I (t) in coil, and this is the source electric current in excitation pulse magnetic field.

Claims (5)

1. the inductor of a subregion progressive molding composite bimetal pipe, the profile of the inductor of described subregion progressive molding composite bimetal pipe is cylinder (13), the both ends of the surface of described cylinder (13) in axial direction are processed with respectively a truncated cone-shaped groove (10), the middle part of cylinder (13) is processed with a pilot hole communicated with two truncated cone-shaped grooves (10), described pilot hole and the coaxial setting of two truncated cone-shaped grooves (10), the zone that pilot hole surrounds is workspace (6), radially have the slit (14) communicated with pilot hole on the sidewall of cylinder (13), it is characterized in that: described pilot hole consists of large truncated cone-shaped hole (11) and little truncated cone-shaped hole (12), the smaller diameter end in described large truncated cone-shaped hole (11) overlaps with the larger diameter end in little truncated cone-shaped hole (12), and the larger diameter end in large truncated cone-shaped hole (11) and the smaller diameter end in little truncated cone-shaped hole (12) lay respectively at the two ends of pilot hole, the angle become between the bus of setting large truncated cone-shaped hole (11) and horizontal plane is α, the angle become between the bus in little truncated cone-shaped hole (12) and horizontal plane is β, the axial length in large truncated cone-shaped hole (11) is L1, the axial length in little truncated cone-shaped hole (12) is L2, the axial length of pilot hole is L0,

L0=L1+L2 (2)

The size at described α angle is calculated and is obtained by formula (3);

$\mathrm{\&alpha;}={\tan }^{-1}\left(\frac{0.5~3\mathrm{mm}}{L1}\right)---\left(3\right)$

The size at described β angle is calculated and is obtained by formula (4);

$\mathrm{\&beta;}={\tan }^{-1}\frac{r_{\mathrm{gap}}}{2~6\mathrm{mm}}---\left(4\right)$

In formula: r _gapradial clearance for 4 of internal layer pipe 5 and outer pipes.

2. a kind of inductor of subregion progressive molding composite bimetal pipe according to claim 1, is characterized in that: the axial length L 2=2mm in described little truncated cone-shaped hole (12)～6mm.

3. a kind of inductor of subregion progressive molding composite bimetal pipe according to claim 1, it is characterized in that: described large truncated cone-shaped hole (11) is provided with the great transition fillet with the junction in little truncated cone-shaped hole (12), the radius of curvature of described great transition fillet is R1, R1=20mm, large truncated cone-shaped hole (11) is respectively equipped with little knuckle with junction and the little truncated cone-shaped hole (12) of adjacent truncated cone-shaped groove (10) with adjacent truncated cone-shaped groove (10) junction, the radius of curvature of described little knuckle is R2, R2=1mm.

4. according to the inductor of claim 1,2 or 3 described a kind of subregion progressive molding composite bimetal pipes, it is characterized in that: described inductor is formed by the metal material processing of high strength, high conductivity.

5. a kind of inductor of subregion progressive molding composite bimetal pipe according to claim 4, it is characterized in that: the metal material of described high strength, high conductivity is zirconium chrome copper or beraloy.

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